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Sealed vs ported

The practical difference between sealed boxes and ported boxes.

Basic Enclosures 1 min read
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Why it matters

The enclosure changes bass output, cone movement, box size, tuning behavior, and failure modes.

Sealed boxes are usually simpler and more forgiving. Ported boxes can produce more bass near tuning, but the port must be sized and tuned correctly.

How it works

A sealed box acts like an air spring behind the driver. It rolls off smoothly and has no port output.

A ported box uses the air in the port as a resonant system. Around the tuning frequency, the port contributes output and cone movement drops. Below tuning, cone control can fall quickly.

Common mistakes

Simple example

Frequency response Frequency response shows how loud a speaker is at each frequency. It helps reveal balance, crossover behavior, box tuning, and room problems. Port noise Port noise happens when air speed through the vent gets high enough to chuff, whistle, or compress output. Weak bass Weak bass is often caused by polarity, placement, room nulls, level mismatch, leaks, or tuning problems. Check those before changing drivers.

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